Question

1. You are calculating the rate of reaction for A^{+} +
B^{-} → AB. Your tangent line slopes are from graphs of
absorbance of A^{+} versus time in minutes. You have the
following experimental data:

Trial | [A^{+}] in M |
[B^{-}] in M |
Tangent Line Slope in Abs/min |

1 | 1.00 | 0.380 | -0.540 |

2 | 1.00 | 1.00 | -1.89 |

2 | 0.25 | 0.380 | -0.170 |

Convert the slope of Trial 1 to a rate with units of M/min. The
molar absorptivity of A^{+} is 38700
M^{-1}cm^{-1}.

2.

Using the data from Question 2 (copied below), determine the
reaction order with respect to species A^{+}. You will need
to convert the other tangent line slopes into rates of reaction in
order to do this.

Question 2: You are calculating the rate of reaction for
A^{+} + B^{-} → AB. Your tangent line slopes are
from graphs of absorbance of A^{+} versus time in minutes.
You have the following experimental data:

Answer #1

1.

Slope of trial 1

Rate ( in M/min)

2.

For trial 1 the rate ( in M/min)

For trial 3 the rate ( in M/min)

For trials 1 and 3, the concentration of B- is held constant. The concentration of A+ is quadrapuled from 0.25 M to 1.00 M. The rate of the reaction increases from to

For trial 1

....(1)

For trial 2

....(2)

Divide equation (1) with equation (2)

Take log on both sides

The order of the reaction with respect to A+ is approximately equal to 1.

The following reaction was monitored as a function of time:
AB→A+B A plot of 1/[AB] versus time yields a straight line with
slope 5.5×10−2 (M⋅s)−1 .
If the initial concentration of AB is 0.250 M , and the reaction
mixture initially contains no products, what are the concentrations
of A and B after 80 s ?

The following reaction was monitored as a function of time:
AB→A+B A plot of 1/[AB] versus time yields a straight line with
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What is the value of the rate constant (k) for this
reaction at this temperature?
What is the half-life when the initial concentration is 0.55
M
If the initial concentration of AB is 0.220 M , and the reaction
mixture initially contains no products, what are the concentrations
of A and B after 70...

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Procedure
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2. Construct a data table in lab book. You will need to record
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Hooke’s Law Hooke's Law For this lab you need to plot a graph of
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